JPH08117892A - Direct moving device for die set - Google Patents

Abstract

PURPOSE: To prevent the impact force or the shock from being generated when a guide bush is ascended and descended in a die set direct moving mechanism interposing a retainer provided with rollers between a guide post of a polygon of the cross-section erected on one side die and the guide bush installed on the other die. CONSTITUTION: The tip of a guide post 1 is made in a taper face part 101, the shape of the tip of each band shaped flat face part 11 of the guide post 1 is set to a chevron shape whose breadth is mad gradually smaller toward the tip, and a taper face part 220 contracting toward the inside is formed on the internal circumference of the opening end part of the guide post inserting side of the guide bush 21. Then, a recessed groove 221 recessing toward outside is formed between mutual band like flat parts 22, 22, and at the end of the guide post inserting side of the band like flat part 22, a chevron type cut part converted toward inside is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion device for a die set, and more particularly to a linear sliding (linear motion) mechanism between a guide post and a die holding plate supported thereby.

[0002]

2. Description of the Related Art In press dies, the accuracy of die matching greatly affects the processing accuracy, and a die set is used to improve the accuracy of die matching. As shown in FIG. 1, this die set usually supports a pair of guide posts (1) (1) standing upright from a lower die (2a) so that the upper die (2b) can be raised and lowered. Then, the die (D) is attached to the lower die (2a), and the punch (P) is attached to the other upper die (2b). At this time, if the die (D) and the punch (P) are accurately opposed to each other,
Since the lower die (2a) and the upper die (2b) have a relationship of directly moving linearly via the guide posts (1) and (1), the setup time in press working can be shortened. This is because the accuracy of the relative position between the die (D) and the punch (P) can be secured simply by setting the die set equipped with the die (D) and the punch (P) on the press machine.

The above (1) and the upper die (2b) are paired by a linear motion mechanism.
It has a great influence on the linear motion accuracy of (D) and punch (P). or,
The smoothness of movement of this portion affects the processing speed of press working. Therefore, in the past, a mechanism similar to a rolling bearing was adopted for this linear motion mechanism, and many steel balls were installed between the guide bush (21) and the guide post (1) mounted on the upper mold (2b). (20) is interposed.

In the case of using this steel ball (20), the steel ball (20) is provided between the guide post (1) and the guide bush (21).
If you insert the under pressure, the guide post (1) initially
Although there is no sliding gap between the guide bush (21) and the guide bush (21), sufficient linear motion accuracy is obtained and the linear motion resistance is small, but the steel ball (20), the guide post (1) and the guide Among the contact parts with the bush (21), especially the guide post (1)
It is easy for scratches along the direction of relative movement to come in contact with the surface of When the steel ball (20) rolls and makes relative contact with the surface of the guide post (1) under pressure, the area of this contact area is extremely small. 20)
A groove-like trace is formed on the surface of the guide post (1) along the movement locus of. As a result, guide posts (1)
A sliding gap corresponding to the trace is generated between the rolling element (20) and the rolling element (20), and the linear motion accuracy of the linear motion mechanism part is reduced.

In order to eliminate such inconvenience, a steel ball (20)
A roller as a roller is proposed as Japanese Patent Laid-Open No. 3-81035. As shown in FIG. 2, this one has a plurality of guide posts (1) and (1) which are erected on the lower mold (2a) and each of which has a polygonal cross-sectional shape, and the inner peripheral surface of the guide bush (21) is also the above-mentioned. Since the retainer (3) including the rollers (23) and (23) has a polygonal shape similar to the cross-sectional shape, and the roller (23) has the same polygonal shape, the roller (23) has an outer periphery of the guide post (1). The strip-shaped flat surface portion of and the flat surface portion of the inner periphery of the guide bush (21) are in contact with each other. Therefore, the rolling contact area between the rolling element (20) and the guide post (1) or the guide bush (21) is wider than that of the conventional one in which the steel ball (20) is used as the rolling element (20), and the rolling contact area is long. Even if it is used for a long time, there is no trace of roller movement on the surface of the guide post (1).

However, in this improved example, the roller is
When (23) is pressed into or out of the guide bush (21) and the guide post (1), an impact is generated and the operation is not smooth. In some cases, the roller is damaged or deformed. When the upper die (2b) is moved up and down, the guide bush (21) moves up and down with respect to the upper end of the guide post (1). At the same time, the retainer goes in and out. Therefore, the roller (23) repeats the operation of escaping from between the guide post (1) and the guide bush (21) and press-fitting between them. Therefore, the roller (2
Unreasonable external force at the time of press-fitting is repeatedly applied to 3), which causes the above-mentioned impact, and in some cases, the roller is deformed or damaged.

Also, when assembling the guide bush (21) and the retainer to the guide post (1), it is necessary to press fit the entire area of the roller (23) in the longitudinal direction at the same time. This work was difficult to do because the acting force was too large. The present invention is such a "lower mold (2a) and upper mold"
(2b) The guide bushes (21) and the rollers (23) (23) are inserted into each of the penetrating parts by passing a plurality of guide posts (1) (1) having a polygonal cross section upright on one side through the other mold. A linear movement mechanism including a retainer having a roller is provided, and the belt-shaped flat surface portion (22) on the inner circumference of the guide bush (21) and the belt-shaped flat surface portion (11) on the outer circumference of the guide post (1) are connected to the roller. (23) The guide bush in the direct-acting mechanism for the die set that is brought into rolling contact by (23)
When the (21) moves up and down, it should have sufficient durability so that impact force or shock will not occur, or the roller (23) will not be scratched or deformed.In addition, the guide bush (2
The task is to facilitate the assembly of 1) and the retainer to the guide post (1).

[0008]

[Technical Means] The technical means of the present invention taken in order to solve the above-mentioned problem is that the tip of the guide post (1) is a tapered surface portion.
(101) and each flat strip of the guide post (1)
The shape of the tip of (11) is set to a chevron shape whose lateral width gradually decreases toward the tip, and the inside of the open end of the guide bush (21) on the guide post insertion side faces inward. Form a taper surface part (222) that shrinks,
(22) A groove (221) that is recessed outward is formed between the two, and a chevron-shaped cutout portion that projects inward is formed at the end of the strip-shaped flat surface portion (22) on the guide post insertion side. It was formed ”.

[0009]

The above technical means of the present invention operates as follows. The tip of the strip-shaped flat portion (11) of the guide post (1) is a tapered surface portion, and the strip-shaped flat portion (2) of the guide bush (21) is
Similarly, in 2), the end portion on the guide post insertion side is a tapered surface portion, and the roller provided in the retainer is press-fitted again between the strip-shaped flat surface portions after being disengaged from the tip of the guide post (1). At this time, they are press-fitted in such a manner that they are guided to these tapered surface portions.

At this time, the tip of the strip-shaped flat portion (11) has a mountain shape whose lateral width gradually decreases toward the tip, and the end of the other strip-shaped flat portion (22) on the guide post insertion side is formed. , Because there is a protruding chevron cutout inward, roller (23)
Is press-fitted in such a manner that its central portion can be slightly curved outward. (See FIG. 10.) Then, from this state, as the guide bush (21) descends, the entire area of the roller (23) gradually becomes strip-shaped flat portions (11) (22).
It will be pressed in between. Therefore, the rollers (23) can be smoothly press-fitted.

This can be said when assembling the guide bush (21) and the retainer.

[0012]

[Effects] The present invention having the above-described structure has the following unique effects. As the guide bush (21) moves up and down, the rollers
When (23) (23) appears and disappears with respect to the belt-shaped flat surface portions (11) (22), press-fitting between the belt-shaped flat surface portions (11) (22) of the roller (23) is reasonably and smoothly performed, Retainer and guide bush (21)
No shocks or shocks occur when moving up and down. In addition, it is difficult for the roller (23) to be damaged or excessively deformed, and the durability is improved.

This can be said when assembling to the guide post (1), and it is easy to assemble the above three members.

[0014]

Embodiments of the present invention will be described below with reference to FIGS. In the first embodiment shown in FIGS. 3 to 9, the guide post (1) is attached to the lower mold (2a) in an upright state by using the washer (10) and the mounting bolt (13). Is the same as the conventional one. (See FIG. 2) At the base end of the guide post (1), as shown in FIG. 5, there is formed a press-fitting shaft part (14) for press-fitting into the lower mold (2a), and at the upper end thereof. A brim portion (15) is formed. The upper part of the collar part (15) becomes a polygonal shaft part (16), and this polygonal shaft part (16) is in the range from the tip of the guide post (1) to the vicinity of the collar part (15). It is set.

As shown in FIG. 3, the cross-sectional shape of the polygonal shaft portion (16) is such that the top of an octagon is an arcuate portion, and the center of this arc coincides with the center of the guide post (1). I am allowed. Therefore, between the arcuate parts, the strip-shaped flat part (11)
Becomes The upper end of the guide post (1) is formed on the tapered surface portion (101). The inclination angle of this tapered surface with respect to the guide post axis is set to 5 to 15 degrees. As a result, as shown in FIG. 5, the upper end of the strip-shaped flat portion (11) has a mountain shape in which the center of the upper end approaches the tip of the guide post (1) and both sides recede from the tip. Then, both ends of this chevron-shaped tip portion are connected to the arc-shaped portions on both sides of the strip-shaped flat surface portion (11).

Further, as shown in FIG. 3, the guide post (1)
The guide bush (21) to be fitted onto the outer peripheral cross section of the guide bush (21) has a circular shape, while the inner peripheral cross section of the guide bush (21) has an octagonal shape similar to that of the polygonal shaft portion (16). (22) is formed parallel to the axis. A groove (221) is formed between the band-shaped flat portions (22) and (22) so as to be recessed to the outside.

Furthermore, the lower end open portion of the guide bush (21) is a tapered surface portion (222) as in the case of the guide post (1), and the inclination angle of this tapered surface portion (222) with respect to the guide bush axis is 5 as well. It is set to 15 to 15 degrees.
And, as shown in FIG. 6, the lower end of the strip-shaped flat portion (22) is
It has a form in which the projecting chevron cutting portion (220) is provided above. The chevron cut portion (220) serves as the tapered surface.

In the case of the above combination, when the guide bush (21) is fitted onto the guide post (1) concentrically,
As shown in FIG. 4, a gap (G) is generated between the strip-shaped flat portion (22) and the strip-shaped flat portion (11), and the respective gaps on the outer periphery of the flat portion of the guide post (1) have the same value. A retainer (3) having a large number of cylindrical or cylindrical rollers (23) (23) is inserted in the gap (G). And this retainer
(3) is an octagonal tubular body as shown in FIGS. 7 to 9, the wall thickness of which is slightly smaller than the diameter of the roller. And this retainer (3) has eight flat parts (31) (31)
However, a large number of rollers (23) (23) are arranged in parallel to each other in the horizontal direction on each flat surface portion, and each roller (23) has a rectangular opening (31) formed in the flat surface portion (31). Located within 32). As shown in FIG. 9, the opening has a sectional structure in which small tongues (34) and (34) project from the inner surface side and the outer surface side of the flat surface portion (31) toward the inside of the opening (32). The rollers (23) and (23) are sandwiched by these tongue pieces (34) and (34) and are held within the wall thickness of the flat surface portion (31). The top part projects from the surface of the flat part (31) over the entire area in the longitudinal direction.

The gap (G) is set smaller than the diameter of the roller (23), and the retainer (3) having the rollers (23) and (23) is provided between the guide post (1) and the guide bush (21). When these rollers (23) and (23) are inserted and press-fitted between the guide post (1) and the guide bush (21), the guide bush (21) and the guide post (1) are separated from each other as shown in FIG. It will be a kinematic pair in the axial direction.

At the time of the press-fitting, the roller (23) has the strip-shaped flat surface (1
When located between the upper end of 1) and the lower end of the strip-shaped flat portion (21), the outer surface side of both ends of the roller (23) is a flat portion of both ends of the chevron excision portion (220) as shown in FIG. The inner surface is in contact with the central top of the upper end of the strip-shaped flat surface portion (11). In this state, the roller (23) can be slightly curved outward. After that, as the roller (23) is press-fitted between the belt-shaped flat portions (11) and (22), the contact area with these flat portions becomes wider, and finally the entire region in the longitudinal direction of the roller (23) is changed from the inside to the outside. It comes into contact with the belt-shaped flat portions (11) and (22). Therefore,
This roller (23) can be smoothly press-fitted.

By the above-mentioned action, the guide posts (1) and (1) are attached to the lower mold (2a) at regular intervals, and the guide bushes (21) which are paired with the guide posts (1) in the above-described manner are paired up. The die set is assembled by press-fitting and fixing in a through hole opened at a predetermined position of the mold (2b). In the above embodiment, the polygonal shaft portion (16) of the guide post (1) has an octagonal cross section, but as shown in FIG.
6) may be provided. In this case, the flat strip
(11) and the width of the arc-shaped portion is set to almost the same value, when the tapered surface of the upper end is formed as in the above embodiment, the bottom length of the chevron portion of the upper end of the belt-shaped flat surface portion (11) The ratio of the height from here to the top becomes large. Similarly, the ratio of the height of the lower end of the strip-shaped flat portion (22) of the guide bush (21) corresponding to this to the bottom of the chevron-cut portion (220) is increased. Therefore, the smoothness when the roller (23) is press-fitted between the roller (23) and the belt-shaped flat portion (22) is improved as compared with the octagonal section.

Further, the guide post (1) can be mounted on the upper mold and the guide bush (21) can be mounted on the lower mold.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional example.

FIG. 2 is an explanatory diagram of a prior art using a roller.

FIG. 3 is a plan view of an essential part of an embodiment of the present invention.

FIG. 4 is a sectional view of an essential part.

[Figure 5] External view of the guide post

FIG. 6 is a sectional view of the guide bush (21).

FIG. 7: Cross-sectional view of retainer (3)

FIG. 8 is a plan view thereof.

FIG. 9 is an enlarged sectional view of a roller holding portion.

FIG. 10 is a sectional view when the roller (23) is press-fitted.

FIG. 11 is an external view of a guide post of another example.

[Explanation of symbols]

(2a) ・ ・ Lower mold (20) ・ ・ Rolling element (1) ・
・ Guide post (16) ・ ・ Polygonal shaft (2b) ・ ・ Upper mold (23) ・ ・ Roller (21) ・ ・ Guide bush

Claims (2)

[Claims] 1. A plurality of guide posts (1) (1) having a polygonal cross section, which are erected on one of a lower die (2a) and an upper die (2b), are passed through the other die, and each penetrating portion is Guide bush (21) and roller (2
3) A linear motion mechanism consisting of a retainer having (23) is interposed, and a strip-shaped flat portion (22) on the inner periphery of the guide bush (21) and a strip-shaped flat portion (11) on the outer periphery of the guide post (1). ) And the rollers (23) and (23) in rolling contact with each other, in the direct acting mechanism for the die set, the tip of the guide post (1) is tapered (1).
01) and the strip-shaped flats (1) of the guide post (1).
The shape of the tip of 1) is set to a chevron shape in which the width gradually decreases toward the tip, and the inner circumference of the open end of the guide bush (21) on the guide post insertion side shrinks inward. Taper surface part (222) is formed, and
2) A concave groove (221) that is recessed outwardly is formed between (22), and the end of the strip-shaped flat surface portion (22) on the guide post insertion side is
Linear motion device for die set with a chevron cutout formed inward. 2. The inclination angle of the tapered surface portion (101) of the guide post (1) with respect to the guide post axis is set to 5 to 15 degrees, and the inclination angle of the tapered surface portion (222) of the guide bush (21) with respect to the guide bush axis is set. The linear motion device for die set according to claim 1, wherein the angle is set to 5 to 15 degrees.